On this week’s Film Club, A.V. Club film critics A.A. Dowd and Ignatiy Vishnevetsky find themselves disagreeing over The Great Wall, the extravagant Chinese-American co-production that stars Matt Damon as a European who travels to China to steal the formula for gunpowder, but instead ends up fighting aliens alongside an army of Chinese super-soldiers. Is it rapturously dumb or gorgeously boring?